Make Clone functions const.

Signed-off-by: Deukhoofd <Deukhoofd@gmail.com>

src/Battling/Models/LearnedAttack.hpp

@@ -29,7 +29,7 @@ namespace CreatureLib::Battling {
         virtual void RestoreUses(uint8_t amount) noexcept;
         virtual void RestoreAllUses() noexcept;
 
-        virtual LearnedAttack* Clone() {
+        virtual LearnedAttack* Clone() const {
             auto* attack = new LearnedAttack(_attack, _maxUses, _learnMethod);
             attack->_remainingUses = _remainingUses;
             return attack;